How to properly insert variables into an array?

Question

PHP

Greetings!
There is an array in which you need to insert variables with values.

//Для примера переменные:
$site_subdomen_domen = 'www.yandex.ru';
$site_name_url = 'yandex.ru';
//Вставляю в массив
$allowedDomains = [
  "site_subdomen_domen",
        "site_name_url"
    ];

I expect to get the result:

$allowedDomains = [
  "www.yandex.ru",
        "yandex.ru"
    ];

But the values ​​of the variables are not written into the array.
What am I doing wrong?
Thanks in advance for any help!

Answer 1

<?php

$allowedDomains = [
  $site_subdomen_domen,
  $site_name_url
];

Answer 2

I would start by learning the basics and syntax of the language